SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47d5a6955b1c6369f488ca68ba7629d0447198c7b00d76c29c4f79da2df1638a' 
  AND token = 'So4ldVfJYQvfxP3zOxIK3UCUa8GoYC4+pQd3xxRcSBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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