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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9965b97c8d7573b227608b78d03ca8e7b214d8c17dc44fb4b3bef3871b8f3d8' 
  AND token = 'InPuRZqajCeIw0PC9y06EX3TE0PGiUuOQ4mzEiq/q9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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