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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4026da8755b6fac3e5aed147cc3581b719054e597c294519ed74e92d97de0734' 
  AND token = 'ZTSvX5YZG3A8Ry/6GONe3QIZ+OfDZpaJDl7jhOlueG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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