SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8b6e36bad7ae629081b64db9fd62b8ffb031b2ecb6d75b9cb95bc55d038c465' 
  AND token = 'm+rvcyojle5xXjR/7zWDVAcIHkJQJZPRBFX3X9qWtBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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