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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42d61b9a6dd26a430a7c5ca9d84f30a5043de6c42358b8c2ab30ad57690c419a' 
  AND token = 'bRPM6tgxg/cFYtFJkfW/+RIxH/psqW2+eZpT2YJRq64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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