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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f5fa3b00b1263dc3617f87e84cad9b498955666496d2336f3967317e485d37f' 
  AND token = 'poNfg3AP7Fep/WtfP7qxDqdfknWn7/UvxpaSu/hHPJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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