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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '78c87fb114dda5fe86db4068c31a833fbf93ac928641b445e213984df0fe2355' 
  AND token = '5DXwx5t4nO5WhbDH9TBcY7Klb0PBRifoObDs2HXzqw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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