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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2014504e4537412dc5c4583949255f60b38d1ce03f1bbb078577a30aa2b231e6' 
  AND token = '9EuxajSXKMZUK2ibd/QHV2Nrj1CPptN0WWWR87rArA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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