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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '429c015784382eeec40fd4fa65a76ed60fd711a9d688bbd27ed860da478031e9' 
  AND token = 'Yy3tra4wfymnNH1kuNM74MhvDZYhkof/qUaSnaXOg6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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