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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e63e6c9645bf70ec25721c07e22a10706af43effa35967808bdc1bd0ed1ab23e' 
  AND token = 'Mwcj1/QjyrjyfCh5zZqWR/70ZrNS410JSD0/EbV2Hs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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