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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7617a87ed81af052036e7a9b9633c50cb3c19abcbfe2a77fef8f257dd1a051d' 
  AND token = 'bvlGBA8fD26dlfP7RnzWLwrnQAhg33aCLI4Et4xFGPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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