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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd855b58e70e3cec3333447792383df22e274a5564096b6a826000338edd8b400' 
  AND token = '5ocqhnnDn7LOkJVaLQuyNcYmKYO7922gEP0jHnlRJrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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