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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed68b95549b59889fd4b65237db15e9237e5ce355d1e2f444337f5645b4f36cc' 
  AND token = '2ydyz847QbRRS3PV2/oX3IOOfo/FBPPQDvXJkiWUUEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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