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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0d12aa34bf553d994b3a566e93e0325b87419cf87a41eebb2d7f637037647fc' 
  AND token = 'yf7xf5jaMWzQtXq/BY6Remvesoo/yuW6upfmSeBjJeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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