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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d454bbc60f7f5a8b9009c9846bcc04033bec623fd1c4b8c69822c3017cc8892' 
  AND token = 'fEb49ghfzvKE7KRCqILiVrbDAAw0XMClJgxt7gc4xqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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