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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd11c97e06df6e25d3d5c6cbc36db1f9dfe7b2d281388dd5863333d41b39e0d1a' 
  AND token = 'u2fGo0xTpkj/7uvRCBJlZHkE2OfRS9vj6ylpOUSWgtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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