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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93f193b9f97c6f6bf592059e25029e9d116d6b6e9cd93407fe4fbd9ce789df5c' 
  AND token = 'Aa8lL8x7cju7Zs9fwmRGRTcnwNJMkTYt3f3k3tgGdi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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