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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb3c9f08015efb0cfc6ff9a6b0704e4a6b5cbd0024d5a4b473276badb41dcf24' 
  AND token = 'mSodNFIKTscMtf1v1vKITN7l2aIUxBRvOOnZMFr6uE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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