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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b69bf02706704eb82dd9a48e71240f16454033a9535db8e188ae0fb7faeb41c' 
  AND token = '0jAHu+zscXou83DWrB+MpSc6t5xtCykKnccEKOvTyLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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