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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42119df791bdc00df0c47abb0c4980614125fde630f8f79f450fe6f9af829f16' 
  AND token = 'tYKwVPe9ssjKy8p7x7APrLujClNf4w093uC9S+76Uo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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