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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4cb6750a52930a869e3525161fddf388ecae0dc1296760ee677aad5128f86d31' 
  AND token = 'JCcnSQTzcDRhZVxwAkd+MqtLkSZ1109tl2b3O9gIZRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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