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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '961b8b49e771b17ba37cdf779deb89d21855f4ab23ddb7d4df1e4f47f30b7348' 
  AND token = 'b2B8F5Sqi6P/0hFa0k86hKdhBWlnj7YT71TAbP5VqqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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