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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9236d3a9bb08bff28f478348e1713f5a42e54204b026ba01dbfd7a87e7a30d91' 
  AND token = 'iek0Xdid9PM+iiC45x0zPMvmBJTYkGvLpCQb5Sqw96k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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