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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e85f738d75f07b4e607d5e0a9d0d847011a388eddb6513662f7113621a86be9' 
  AND token = 'LWnVJTiKKVPjYPLc4GJITaC4oTScM3RR0fD1SHv0WC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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