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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d6ce4a65ba4e3f8ef4cf7e523049158c42c26375104de7d5b85616ea780f69c' 
  AND token = 'UPeg7P7yxJ8Ztqmqi28EFGvuxkjKHCZ3HLnx5F3cvE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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