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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3001e9bfb6cd3045e2c557ee278b5aa21992e601eba536f017426b87e610d41b' 
  AND token = 'ZWT94XH1qR8XtcdacAhBQ0P/O2WUHcUlaQbq5i966GI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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