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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a42893695583c2e97b42e7c695a7ea27e060aa9b65ca6ad6dbc452dd7a23dbb9' 
  AND token = 'HYhQGLXVyOjzx2CxUEtnlf7k6l3sVY08LihagTbCD1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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