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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b46404e96bb1fa1411c0b025aeccad6f13c6f6d07c3d8d36ce9019c6573eacf1' 
  AND token = 'qoEJElvRZQmf8e3cz++N+eX9ZEgBsyqyzCEIQGgJT2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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