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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '079c369cecb469e4e891a134fae6137df4b01b4ba0f4b6747fa91cebf07ed900' 
  AND token = '4jQF/+f7fLP+ZRJMKb1fC/VpTcFA9rneCdHTUS0s03E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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