SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b9e315418e9b418743f674c8611ded3868a780703d09c78b279574aa46b36a2' 
  AND token = 'W9PFqG4vqssjqQ8TjrKPw49RHUqDHlwk++RzLR/Qa1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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