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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6f7372be90ac1608ee9d1fdfc63173fba362505d7f2d9d92b39332dfc13f9e4' 
  AND token = 'l0rD99Nbp6whQGi+E7uOojwRnbDfq87MEqg59/HQkiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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