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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e441afd8f1ea26b514d6006021746026b87a45e615da00f81aef069c0d1780f' 
  AND token = '6yzBfd837JxiKcwK/A7CeG0lsR1kIkoP2eaw3MwOlQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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