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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d34e24e088e873e724f576ee4ce3f3e57d8a80e7361b26f447914115a2be81d' 
  AND token = 'FUnuO9RvSgq0LmTgpQixdaHKY4np4vE6DJVAuI6cF9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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