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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47ed85aeb5415ab0e77fb76b178b6a757c685f162ea9d0e96bbab87649c3fbef' 
  AND token = '03bvIhzcLDcJshunATAhYDnt2UrIp0ODB+hLHgi/pu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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