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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bae50e00337eaa4b6e0347e5fd22357a9bc40f0d592688276d37a2c1b39deaed' 
  AND token = 'krxlFgA8fLXtxu0YxHOsY+FaSeiTCcRf8hWJv8d6ZGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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