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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a370e660d94aaf7ec76b7f3bfb44a9aaea5042ffc7bdf896359457d9f05a6083' 
  AND token = 'Pjlqg1OMYagj9SUUEUFtU1neTbefBCRZKYgvo5VtB40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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