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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb413283b8177e647ca5ffb23e30af971a8631e00f02830fc7f465473c1c1792' 
  AND token = 'OdqyyA8YPGFs3YWYW9+HYhVhrUesteouI/4NRXM4MlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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