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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '501ec34355d0a5c3024d967b5bae51e8ed2c842d473bbf7a15fc9b1dcab38ccc' 
  AND token = 'uht4LSs6v6VGEoQ2jK9EKQoRq07LH8okx/jar0//ryE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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