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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fed9a787a96b2274028dbcefac5e46e5805fa6624cfc37f2e63951ea68471e45' 
  AND token = 'nnITA93dC3Q3FHuJtfmHdnGeFmyMQvbqcy4v+2KsP5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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