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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1366654b3a9aa836698ec29fce2edd00240f63ae3a1ce43dfc7c9e69a764fee5' 
  AND token = 'z8pXSmh5MobcMTQTtphSeUk7OSQwscd/IwHWSxzJkBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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