Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3bb37b7e217b4a9777a0a1e6fb52de02872a16e925587cabb53af6ac7e35c11e' 
  AND token = 'M8pYAOUOrZFQ5rVkqyGHhF/tb20dEIJamlj5xtLBn1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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