SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '283f940248f7e7d9aa2dbdb950d9154123c8ede23953858a660018afe03fed74' 
  AND token = 'AZVWn2pRqn4tM7B5KL/xoeig0xNXBLiJ++0Y0H/FTX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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