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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'afd341f81f370a7eaf167a8f384db740aa0bcf2e56da39d7386576cabcd1db7f' 
  AND token = 'QS/k3UPXkxCIF1CCDPhWTEbU6ntC3ks0VUhIFm1DoEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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