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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f0a4d1868961f16534d0c540d15642b17cfc5f713280603e922c8e5c267ded2' 
  AND token = '4xlsjwP565KDaXqtwEuPpJfTVTt1fZyuqg74YfKeQ4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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