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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ee496365d5904babb36880839c80ec76ef8d099dc1267493225adb5cb498eac' 
  AND token = 'SdXQ87+sd0TB9a//HthLPb8714bCh+rFykw50I/SCI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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