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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0831ca66475b00c0ef6cecf69aa5455a0eecd0028908f45fb29308f24cd67bad' 
  AND token = 'iZnWw73Ts2pZ/VipuO2QFTetK7GXeY1GoFy7JwmDTTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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