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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6dfe3a8122e889c6e9750500998d495bbef3722750b9e0257a9bf72add1ba06b' 
  AND token = '6Z2iPOyXW30IJRVWklsyVDBuXo8fv4JFq5m5m+e5D8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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