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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a9eec311327f2cc8ea08ce96049f8c21c2ead14d71ba95899afbda949b6f39a' 
  AND token = 'K1lXLnCCUgQW9hNGEaXG5DTkDY/klAWWO8uMDuujank=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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