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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76330fe3e14413e95c4e0b9e6e155dc6bf38e2508293d53384fe29b2f6e17b1c' 
  AND token = 'C5WHa7A9D5XC8oJuYWHXSPwBw60E/oQ+o2EE4ngdj6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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