SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3904e0362b458c19d3780543521b5d7edc7795a6b9a7f5aadb5df0ef5fd10e9' 
  AND token = 'Wa46Fgn/VGv6bCUKFxq9eQFzox/jVYF9UbTn5ZX+Ot0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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