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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb7feedd1f7d3eaf9c50d2c838d6d676b92672e56da0bbf5280fcfbfe99f965c' 
  AND token = '8b/uqVzhOzLODWT6LlXRW536PbJ1OuQe6jT8fn53VEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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