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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1bf4834b83e61deec79bd0e2f07d0e6a5342718fdbad242964357a4263cfd14b' 
  AND token = 'ykhOXMI5s158yXByrKCz9H7MUIeRwiOYZPLYemtAHus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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