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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b14aabd538a68d6a469078c00aaeb7b6ac0dbd6a7c3d1ad378ad31ba1bce573' 
  AND token = 'MrHwZtlA5jOe2BJoxAUqSg3PSnQtALQ2WiOSf4opxgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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