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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'acecdc5c94569fae1b860edf4b0d61c0e9eb0c0c0deef0d05435eeb4940dd611' 
  AND token = '/fXoOiNOkBe+alJyez9CbRiKHzbNAfX2zSZMVHWkGwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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