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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa31dab4daf1f07ce4f7be7d4adb4afb246a1939e841b4b54287728e602fdabc' 
  AND token = 'k9JWyLSuECqe7Y5ZkEVO4TRtdkpdCxjmfGBH8guh6xU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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