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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3205f0f773c53fc241d32d7c7053d0d4390d3347cf31b4969fb1b272151de35c' 
  AND token = 'Mh6NwYG7Pj5bFeuU9cFV08UrqTVAeZhTakjOwEQNggo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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