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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e84222f1fb8906b6e2ee36d6e7b21adf066b1bd2f58940e8c9f8a18390a28308' 
  AND token = '2xsmzU1L1+99eS9BmaNGl6sxcX0iZZZ5uhAVGXMNzJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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