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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '821d70683dbfe63a2c34e3a001ecdddcfcec92ca863b997f11679489f31d584b' 
  AND token = 'KI75ttLw/i7R8g9f5XkRoF7173+2jxA9lM4+tVSZ8PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}