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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8fcdfce2a876dabf2ad2562715d7726b40b4a19b06c1dd4fac3ebea744b545d' 
  AND token = 'mPkGQpWFcJ3y3Mqcc2LwPMMe21+Ftw1u7o7l4CaMMK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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