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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75ea95b74fa38b97185bb3e896e6ec83e8fc7bb9e5a700d5b96985afe39c083d' 
  AND token = '+sJ8ubE/h31zCktiCsDYapdhBnLYDcQ57XNn89FBWqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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