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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01a4eafa2170c95b15ab3016f1ccbdc902912652af2a4b16b7f395a316e707f7' 
  AND token = 'pzf7h9ESHclZ1UIUhcUttjOm19z0zFNYUwIsMY3kUxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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