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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b886244d9db8344101bba02832ed5eb237da8b5ad62008d4b49ae4605b4a5071' 
  AND token = 'Rw/7LzvrUwb4fSW32el5nL8rZ32AwD0EX1K4rc9ZIYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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