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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec10a2b42153412eb77570a2a3a7a1af1774061b8d53ec72fc388aeefa36ba6a' 
  AND token = 'ZFjM4ojkcdrrzayRA6AZT7KrxgWAVgktuD6qQLY/UaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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