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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '72d1fd5aa1fd51f6a736eea30d053cd36367db82ea1ff7844be4259f0e750f42' 
  AND token = 'mpGftEP8t+tAKgiXFryov03/xqVR7IaKsO44mbueWKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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