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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e485f28b9139455114f4250a588b3898a5b87a6122c7094a5d15e136e01d7ca3' 
  AND token = 'EH03BQBhNZf78fKkC4dhbIq1lqVU0UcF5VyTZLubpoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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