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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a72d9d77a42cbc18cd9473913c5825624f222680869ac10b4b82103ff896b3ef' 
  AND token = 'O3mrUC6fUfXlpd2I1ywq4rSzMDfJ9w83rDlmQW79Sv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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