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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '565324fadd9e1af3be6d7c21de0eb7967ce105adb99224b00dfbadd3710bfa4b' 
  AND token = 'eEmkyWnQRVq7S6JqryukrhVh0EDXDx18pHokxzH3mSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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